Microstructure and mechanical properties of Al2O3/Er3Al5O12 eutectic rods grown by the laser-heated floating zone method |
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Authors: | MC MesaPB Oliete VM OreraJY Pastor A MartínJ LLorca |
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Affiliation: | a Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, María de Luna 3, 50018 Zaragoza, Spain b Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid, E.T.S. de Ingenieros de Caminos, E28040 Madrid, Spain c Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid & Instituto Madrileño de Estudios Avanzados de Materiales (IMDEA-Materiales), E.T.S. de Ingenieros de Caminos, E28040 Madrid, Spain |
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Abstract: | Eutectic rods of Al2O3-Er3Al5O12 were grown by directional solidification using the laser-heated floating zone method at rates in the range 25-1500 mm/h. Their microstructure and mechanical properties (hardness, toughness and strength) were investigated as a function of the growth rate. A homogeneous and interpenetrated microstructure was found in most cases, and interphase spacing decreased with growth rate following the Hunt-Jackson law. Hardness increased slightly as the interphase spacing decreased while toughness was low and independent of the microstructure. The rods presented very high bending strength as a result of the homogeneous microstructure, and their strength increased rapidly as the interphase spacing decreased, reaching a maximum of 2.7 GPa for the rods grown at 750 mm/h. The bending strength remained constant up to 1300 K and decreased above this temperature. The relationship between the microstructure and the mechanical properties was established from the analysis of the microstructure and of the fracture mechanisms. |
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Keywords: | Microstructure Mechanical properties High temperature Al2O3-Er3Al5O12 Directionally solidified eutectic oxides |
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